import { v4 as uuidv4 } from 'uuid'
// 要生成一个随机字符串，且每次执行不能发生变化，游客身份持久化存储
let uuid_token
export const getUUID = () => {
  // 先从本地存储获取uuid(看一下本地存储是不是有？)--单例
  uuid_token = localStorage.getItem('UUIDTOKEN')
  if (!uuid_token) {
    uuid_token = uuidv4()
    localStorage.setItem('UUIDTOKEN', uuid_token)
  }
  return uuid_token
}
